<!DOCTYPE html>
<html>
<meta   charset="UTF-8">
<form method="post" action="./login.php">
  <label class="log-lab">用户名
  <input name="username" type="text" value=""/></label><br>
  <label class="log-lab">密码
  <input name="password" type="password" value=""/></label><br>
  <input type="submit" value="登录"/>
</form>
</html>